Aaron Carter Instagrams before-and-after pics, says he 'couldn't wait to show' weight transformation

Aaron Carter has revealed the first peek at his self-care transformation.

The singer posted to Instagram on Saturday (Oct. 7) a before-and-after photo showcasing his recent weight gain, captioned, “From 115 pounds to 145 In a few weeks. On the left 115 on the right 145. Continuing to focus on myself and my health. Sorry I couldn't wait to show you till 2018 #proudofmyself #StressFree I missed you all so much. Needed some time to heal and this is a direct result.”

Carter had checked into rehab on Sept. 22 to “improve his health and work on his overall wellness,” according to publicist Steve Honig, checking out a short two weeks later on Oct. 6. Upon checking in, Carter had tweeted determined messages, saying, “Only I can change my life. No one can do it for me.”

See more photos of Aaron Carter:

31 PHOTOS
Aaron Carter: Then and Now
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Aaron Carter: Then and Now
Aaron Carter (Photo by Jeffrey Mayer/WireImage)
UNITED STATES - OCTOBER 26: USA Photo of Aaron CARTER (Photo by Christina Radish/Redferns)
Aaron Carter & Nick Carter during 102.7 KIIS-FM's 2002 Wango Tango at Rose Bowl in Pasadena, California, United States. (Photo by SGranitz/WireImage)
Singer Aaron Carter performs at the party following the premiere of the animated film "Rugrats In Paris-The Movie" November 5, 2000 in Hollywood. Carter is featured on the film's soundtrack. The film opens November 17 in the United States. RMP/MMR
Singers and brothers Nick (L) and Aaron Carter answer questions about their new reality television program 'House of Carters' which features them and their three sisters on E! Networks during a session at a Cable Television Critics Association press tour in Pasadena, California July 11, 2006. The series will premiere in October 2006. REUTERS/Fred Prouser (UNITED STATES)
Aaron Carter (Photo by Jim Smeal/WireImage)
Aaron Carter during The 9th Annual 'Dream Halloween Los Angeles' Benefits The Children Affected By AIDS Foundation at Barker Hanger in Santa Monica, California, United States. (Photo by Jim Smeal/WireImage)
Aaron Carter & Nick Carter (Photo by Annamaria DiSanto/WireImage)
Aaron Carter (Photo by KMazur/WireImage)
Nick & Aaron Carter (Photo by RJ Capak/WireImage)
FILE PHOTO: Singer Aaron Carter poses on the red carpet at the 52nd annual Grammy Awards in Los Angeles January 31, 2010. REUTERS/Mario Anzuoni/File Photo
NEW YORK, NY - AUGUST 14: Aaron Carter visits at 'The Elvis Duran Z100 Morning Show' at Z100 Studio on August 14, 2017 in New York City. (Photo by Rob Kim/Getty Images)
NEW YORK, NY - AUGUST 14: Aaron Carter visits at 'The Elvis Duran Z100 Morning Show' at Z100 Studio on August 14, 2017 in New York City. (Photo by Rob Kim/Getty Images)
WEST HOLLYWOOD, CA - JUNE 10: Aaron Carter attends the LA Pride Music Festival And Parade 2017 on June 10, 2017 in West Hollywood, California. (Photo by Gabriel Olsen/FilmMagic)
CARSON, CA - MAY 13: Aaron Carter and guest attend KIIS FM's 2017 Wango Tango on May 13, 2017 in Carson, California. (Photo by C Flanigan/Getty Images)
CARSON, CA - MAY 13: Aaron Carter performs at 102.7 KIIS FM's 2017 Wango Tango at StubHub Center on May 13, 2017 in Carson, California. (Photo by Gregg DeGuire/WireImage)
CARSON, CA - MAY 13: Aaron Carter performs at 102.7 KIIS FM's 2017 Wango Tango at StubHub Center on May 13, 2017 in Carson, California. (Photo by Gregg DeGuire/WireImage)
CARSON, CA - MAY 13: Aaron Carter attends the 102.7 KIIS FM's 2017 Wango Tango on May 13, 2017 in Carson, California. (Photo by JB Lacroix/WireImage)
NEW YORK, NY - APRIL 24: Aaron Carter poses during a handprint ceremony and meet & greet with fans as he visits Planet Hollywood Times Square on April 24, 2017 in New York City. (Photo by Bruce Glikas/Bruce Glikas/FilmMagic)
LOS ANGELES, CA - APRIL 28: Aaron Carter attends TuneIn and Heard Well Radio's Launch Party at TuneIn Studios on April 28, 2017 in Venice, California. (Photo by Vivien Killilea/Getty Images for TuneIn)
LAS VEGAS, NV - APRIL 15: Singer Aaron Carter (R) and Madison Parker arrive at the Go Pool at Flamingo Las Vegas on April 15, 2017 in Las Vegas, Nevada. (Photo by Mindy Small/FilmMagic)
LAS VEGAS, NV - APRIL 15: Singer Aaron Carter performs at the Go Pool at Flamingo Las Vegas on April 15, 2017 in Las Vegas, Nevada. (Photo by Mindy Small/FilmMagic)
BEVERLY HILLS, CA - DECEMBER 15: Singer Aaron Carter (R) and Actress Madison Parker (L) attend the 3rd annual Cinefashion Film Awards at Saban Theatre on December 15, 2016 in Beverly Hills, California. (Photo by Paul Archuleta/FilmMagic)
BEVERLY HILLS, CA - DECEMBER 15: Singer Aaron Carter (R) and Actress Madison Parker (L) attend the 3rd annual Cinefashion Film Awards at Saban Theatre on December 15, 2016 in Beverly Hills, California. (Photo by Paul Archuleta/FilmMagic)
LAS VEGAS, NV - APRIL 15: Singer Aaron Carter (R) and Madison Parker arrive at the Go Pool at Flamingo Las Vegas on April 15, 2017 in Las Vegas, Nevada. (Photo by Mindy Small/FilmMagic)
LAS VEGAS, NV - APRIL 15: Aaron Carter performs at the Go pool at Flamingo Las Vegas on April 14, 2017 in Las Vegas, Nevada. (Photo by Denise Truscello/Getty Images)
NEW YORK, NY - JANUARY 30: (EXCLUSIVE COVERAGE) TV personality Sheree Whitfield (L) and singer Aaron Carter visits SiriusXM Studios on January 30, 2017 in New York City. (Photo by Slaven Vlasic/Getty Images)
NEW YORK, NY - JANUARY 30: (EXCLUSIVE COVERAGE) Singer Aaron Carter visits SiriusXM Studios on January 30, 2017 in New York City. (Photo by Slaven Vlasic/Getty Images)
LOS ANGELES, CA - AUGUST 19: Aaron Carter attends Project Angel Food's 2017 Angel Awards at Project Angel Food on August 19, 2017 in Los Angeles, California. (Photo by Gabriel Olsen/Getty Images)
LOS ANGELES, CA - AUGUST 19: Aaron Carter attends Project Angel Food's 2017 Angel Awards at Project Angel Food on August 19, 2017 in Los Angeles, California. (Photo by Gabriel Olsen/Getty Images)
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While he had later said that he’d be disappearing from the social media world to work on himself, Carter made a quick return with Saturday’s Instagram post.

Back in August, Carter came out as bisexual through a heartfelt note on Twitter. At this time he shared a similar hopeful message for his own future, saying on The Bert Show, “All I can say is that I’m really looking forward to the future right now, and whether I choose to be with a man or woman is my decision, and no one else’s.” 

More celebrity transformations:

21 PHOTOS
Shocking celebrity weight-loss transformations
See Gallery
Shocking celebrity weight-loss transformations

Mama June in 2017

The "Honey Boo Boo" star documented her weight loss journey on her very own reality show! She is now down to a size 4 -- and she looks incredible!

(Getty)

Mama June in 2013

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Khloe Kardashian in 2012

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Khloe Kardashian in 2016

Hard work does pay off! The youngest Kardashian sister is obsessed with exercising and documents all her workout sessions on social media.

(Getty)

Lena Dunham in 2015

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Lena Dunham in 2017

The "Girls" star lost a significant amount of weight after going on a holistic diet to help alleviate symptoms of endometriosis. 

(Getty)

Wendy Williams in 2012

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Wendy Williams in 2017

The TV personality revealed in 2015 that she lost 50 pounds over the course of three years with a healthy diet that doesn't include refined sugars, meat, dairy or "eating after dark." It looks like she's been committed to the strict diet. She looks better than ever in 2017!

(Getty)

Ricki Lake in 2010

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Ricki Lake in 2011

The actress lost 20 pounds when she appeared on "Dancing With the Stars" in 2011.

(Getty)

Jordin Sparks in 2008

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Jordin Sparks in 2017

Hard work pays off! "American Idol" alum began her weight loss journey by walking around her neighborhood and the rest was history! Her favorite workout? Zumba.

(Getty)

Sara Rue in 2003

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Sara Rue in 2016

The "Rules of Engagement" star is a total fan of Jenny Craig for its simplicity. She looks incredible and totally glowing!

(Getty)

Jonah Hill in 2014

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Jonah Hill in 2017

Talk about a transformation! Hill has lost weight and gained weight through the years -- depending on the movie he's working on -- but his latest transformation is absolutely jaw-dropping.

(Gett)

Christina Aguilera in 2012

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Christina Aguilera in 2013

Smoke show! The songstress dropped 20 pounds over the course of one year. Doesn't she look incredible?!

(Getty)

Miranda Lambert in 2012

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Miranda Lambert in 2013

The country crooner slammed critics who accused her of having weight loss surgery. She revealed that she dropped the pounds the old-fashioned way -- eating right and working out with her trainer!

(Getty)

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